I want this thread to serve as a potential opportunity for everyone to improve their game-play by sharing experience. You should reply with all non-cosmetic items of your favorite loadout for your main class or others too, explain how you use each item of the loadout together to get kills and stay alive. A lot of us main one class and don't dip too much in the others, with knowledge from each-other we can build some nice loadouts across all classes and maybe try new things based on each-others experience. Some may have loadouts between casual, competitive and our own all-crit servers, all-crit loadouts are favoured but feel free to share any kind you like, just make sure you state which kind.
One of my favourites for Spy is:
Enforcer
Sapper
Cloak & Dagger
It's effective on Snipers. You get to them using cloak, you get outside of their minimal viewing angles they have during being scoped, or perhaps behind them, you disguise pressing 'B' for extra damage with the Enforcer, you then uncloak and shoot them, if you hit them with the first shot, even a body shot will kill them in a single hit, you then cloak again, change position and repeat. This loadout also works great in engineer bases because with cloak and dagger you effectively have unlimited cloak if you don't walk around too much, when the time is right you can kill an engineer, cloak, then sap all of their things one by one, starting with the sentry. This loadout also helps me improve as a Sniper because what you're essentially firing as a spy is very similar to a sniper rifle in it's time between shots, only without the scope, over time using it I've gotten very good at no-scoping as a sniper by playing spy. *All-Crit Loadout*